package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.PasswordConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.EmployeeDTO;
import com.sky.dto.EmployeeLoginDTO;
import com.sky.dto.EmployeePageQueryDTO;
import com.sky.entity.Employee;
import com.sky.exception.AccountLockedException;
import com.sky.exception.AccountNotFoundException;
import com.sky.exception.PasswordErrorException;
import com.sky.mapper.EmployeeMapper;
import com.sky.result.PageResult;
import com.sky.service.EmployeeService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.DigestUtils;

import java.nio.charset.StandardCharsets;
import java.time.LocalDateTime;
import java.util.UUID;

@Service
public class EmployeeServiceImpl implements EmployeeService {

    @Autowired
    private EmployeeMapper employeeMapper;

    /**
     * 员工登录
     *
     * @param employeeLoginDTO
     * @return
     */
    @Transactional
    public Employee login(EmployeeLoginDTO employeeLoginDTO) {
        String username = employeeLoginDTO.getUsername();
        String password = employeeLoginDTO.getPassword();

        //1、根据用户名查询数据库中的数据
        Employee employee = employeeMapper.getByUsername(username);

        //2、处理各种异常情况（用户名不存在、密码不对、账号被锁定）
        if (employee == null) {
            //账号不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }
        //密码比对
        // TODO 后期需要进行md5加密，然后再进行比对
        password = DigestUtils.md5DigestAsHex((password + employee.getSalt()).getBytes());
        if (!password.equals(employee.getPassword())) {
            //密码错误
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }

        if (employee.getStatus() == StatusConstant.DISABLE) {
            //账号被锁定
            throw new AccountLockedException(MessageConstant.ACCOUNT_LOCKED);
        }

        //3、返回实体对象
        return employee;
    }

    /**
     * 员工新增
     *
     * @param employeeDTO
     */
    @Override
    @Transactional
    public void add(EmployeeDTO employeeDTO) {
        //将请求参数数据装到数据库数据中
        Employee employee = new Employee();
        BeanUtils.copyProperties(employeeDTO, employee);
//        //完善数据库实体类剩余数据
//        employee.setCreateTime(LocalDateTime.now());
//        employee.setCreateUser(BaseContext.getCurrentId());
//        employee.setUpdateTime(LocalDateTime.now());
//        employee.setUpdateUser(BaseContext.getCurrentId());
        //获取盐值和初始密码加密
        String salt = UUID.randomUUID().toString().replace("-", "");
        String password = DigestUtils.md5DigestAsHex((PasswordConstant.DEFAULT_PASSWORD + salt).getBytes());
        employee.setPassword(password);
        employee.setSalt(salt);
//调用mapper方法
        employeeMapper.add(employee);
    }

    /**
     * 员工分页查询
     *
     * @param pagedto
     * @return
     */
    @Override
    @Transactional
    public PageResult pageQuery(EmployeePageQueryDTO pagedto) {
        //使用分页查询插件,获取分页查询数据
        PageHelper.startPage(pagedto.getPage(), pagedto.getPageSize());
        //执行条件查询
        Page<Employee> employeePage = employeeMapper.pageQuery(pagedto.getName());
        //封装分页结果为PageResult并返回
        PageResult pr = new PageResult();
        pr.setRecords(employeePage.getResult());
        pr.setTotal(employeePage.getTotal());
        return pr;
    }

    /**
     * 员工状态修改
     *
     * @param status
     * @param id
     */
    @Override
    @Transactional
    public void updateStatus(Integer status, Long id) {
        Employee employee = new Employee();
        employee.setStatus(status);
        employee.setId(id);
        employeeMapper.update(employee);
    }

    @Override
    @Transactional
    public void update(EmployeeDTO employeeDTO) {
        //将请求参数数据装到数据库数据中
        Employee employee = new Employee();
        BeanUtils.copyProperties(employeeDTO, employee);
        //完善数据库实体类剩余数据
//        employee.setUpdateTime(LocalDateTime.now());
//        employee.setUpdateUser(BaseContext.getCurrentId());
        //调用mapper方法
        employeeMapper.update(employee);
    }

    @Override
    @Transactional
    public Employee getById(Long id) {
        Employee emp = employeeMapper.getById(id);
        return emp;
    }
}
